31440401012021 has 4 divisors (see below), whose sum is σ = 31440511401132. Its totient is φ = 31440290622912.

The previous prime is 31440401012017. The next prime is 31440401012023. The reversal of 31440401012021 is 12021010404413.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7880152879921 + 23560248132100 = 2807161^2 + 4853890^2 .

It is a cyclic number.

It is not a de Polignac number, because 31440401012021 - 2² = 31440401012017 is a prime.

It is a super-2 number, since 2×31440401012021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440401012023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54766226 + ... + 55337331.

It is an arithmetic number, because the mean of its divisors is an integer number (7860127850283).

Almost surely, 2^{31440401012021} is an apocalyptic number.

It is an amenable number.

31440401012021 is a deficient number, since it is larger than the sum of its proper divisors (110389111).

31440401012021 is a wasteful number, since it uses less digits than its factorization.

31440401012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110389110.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 31440401012021 its reverse (12021010404413), we get a palindrome (43461411416434).

The spelling of 31440401012021 in words is "thirty-one trillion, four hundred forty billion, four hundred one million, twelve thousand, twenty-one".